/**
 * Copyright 2020 jianggujin (www.jianggujin.com).
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.jianggujin.modulelink.support.inject;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import com.jianggujin.modulelink.action.JActionWrapper;
import com.jianggujin.modulelink.config.JModuleConfig;
import com.jianggujin.modulelink.module.JModule;
import com.jianggujin.modulelink.support.JBeanProvider;

/**
 * 通过类型注入
 * 
 * @author jianggujin
 *
 */
public class JInjectByType extends JAbstractInject {

    public JInjectByType(Object target, Field field, com.jianggujin.modulelink.support.annotation.JInject inject) {
        super(target, field, inject);
    }

    @Override
    protected Object handleValue(JBeanProvider provider, JModule<?> module) throws Exception {
        Class<?> fieldType = field.getType();
        if (JModuleConfig.class.isAssignableFrom(fieldType)) {
            return module.getModuleConfig();
        }
        if (JBeanProvider.class.isAssignableFrom(fieldType)) {
            return provider;
        }

        Object value = provider.optBean(fieldType);
        if (value != null) {
            return value;
        }
        Collection<JActionWrapper> wrappers = module.getActionWrappers();
        // 未找到Bean,尝试查找Action
        if (JActionWrapper.class.equals(fieldType)) {
            if (wrappers.size() == 1) {
                return value = wrappers.iterator().next();
            }
        }

        List<Object> filters = new ArrayList<Object>();
        for (JActionWrapper wrapper : wrappers) {
            if (fieldType.isAssignableFrom(wrapper.getActionClass())) {
                filters.add(wrapper.getAction());
            }
        }
        return value = filters.size() == 1 ? filters.get(0) : null;
    }
}
